I was going to mount a scope on the Ruger No.1 .303. The rifle has a built-in rail for rings, and came with a set of Ruger's proprietary rings. Seems like a pretty good idea.
So I mounted the rings, got out the lapping bar. This is what I got...


There is some #### QC at Ruger, as far as I can see. I've never had any set of rings, with such poor contact surface, after lapping them.
The pics aren't the best, but as bad as the back ring is, the front is much worse. There's almost no contact surface...
I'm not even going to bother installing the scope. The rings will reside in the parts box.
Brutal.
So I mounted the rings, got out the lapping bar. This is what I got...


There is some #### QC at Ruger, as far as I can see. I've never had any set of rings, with such poor contact surface, after lapping them.
The pics aren't the best, but as bad as the back ring is, the front is much worse. There's almost no contact surface...
I'm not even going to bother installing the scope. The rings will reside in the parts box.
Brutal.




























but after that I've had no problems. 





















